Package also installs android-open-url.desktop and androd-open-url-selector.desktop files invoking uriActivity and uriActivitySelector methods which can be set (manually, via xdg-mime tool) to various mimetypes.

Searching activity name for other browser:
Open application desktop file. For example chrome desktop file /usr/share/applications/apkd_launcher_com_android_chrome-org_chromium_chrome_browser_document_ChromeLaunche rActivity.desktop and read last part for Exec line.
Chrome activity: com.android.chrome/org.chromium.chrome.browser.document.ChromeLaunche rActivity

open chrome desktop /usr/share/applications/apkd_launcher_com_android_chrome-org_chromium_chrome_browser_document_ChromeLaunche rActivity.desktop or other browser desktop. Last part of Exec line is activity you search for. For Chrome it's com.android.chrome/org.chromium.chrome.browser.document.ChromeLaunche rActivity

@coderus I can see your PoC would have same useful application for example to intercept SMS from Sailfishos and pass it to dalvik which we need for registration in app Signal. Can you look into it?
Tnx.